Event-Driven Architecture: A Practical Guide

Event-driven architecture (EDA) is a design pattern where the flow of the program is determined by events. This approach enables real-time processing, loose coupling between services, and excellent scalability.

Key components include event producers, event channels (like Apache Kafka), and event consumers. Event sourcing stores state changes as a sequence of events, providing a complete audit trail and the ability to rebuild state at any point in time.

Best practices include keeping events immutable, using schema registries for event validation, and implementing idempotent consumers to handle duplicate events gracefully.